<template>
  <div class="dv-decoration-9" :ref="ref">
    <svg :width="`${svgWH[0]}px`" :height="`${svgWH[1]}px`" :style="`transform:scale(${svgScale[0]},${svgScale[1]});`">
      <defs>
        <polygon :id="polygonId" points="15, 46.5, 21, 47.5, 21, 52.5, 15, 53.5" />
      </defs>

      <circle
        cx="50"
        cy="50"
        r="45"
        fill="transparent"
        :stroke="mergedColor[1]"
        stroke-width="10"
        stroke-dasharray="80, 100, 30, 100"
      >
        <animateTransform
          attributeName="transform"
          type="rotate"
          values="0 50 50;360 50 50"
          :dur="`${dur}s`"
          repeatCount="indefinite"
        />
      </circle>

      <circle
        cx="50"
        cy="50"
        r="45"
        fill="transparent"
        :stroke="mergedColor[0]"
        stroke-width="6"
        stroke-dasharray="50, 66, 100, 66"
      >
        <animateTransform
          attributeName="transform"
          type="rotate"
          values="0 50 50;-360 50 50"
          :dur="`${dur}s`"
          repeatCount="indefinite"
        />
      </circle>

      <circle
        cx="50"
        cy="50"
        r="38"
        fill="transparent"
        :stroke="fade(mergedColor[1] || defaultColor[1], 30)"
        stroke-width="1"
        stroke-dasharray="5, 1"
      />

      <use
        v-for="(foo, i) in new Array(20).fill(0)"
        :key="i"
        :xlink:href="`#${polygonId}`"
        :stroke="mergedColor[1]"
        :fill="Math.random() > 0.4 ? 'transparent' : mergedColor[0]"
      >
        <animateTransform
          attributeName="transform"
          type="rotate"
          values="0 50 50;360 50 50"
          :dur="`${dur}s`"
          :begin="`${i * dur / 20}s`"
          repeatCount="indefinite"
        />
      </use>

      <circle
        cx="50"
        cy="50"
        r="26"
        fill="transparent"
        :stroke="fade(mergedColor[1] || defaultColor[1], 30)"
        stroke-width="1"
        stroke-dasharray="5, 1"
      />
    </svg>

    <slot></slot>
  </div>
</template>

<script>
  import autoResize from "../../../../mixins/autoResize";
  import { cloneDeep, mergeDeep, UUID2 } from "../../../../utils/utils";
  import { fade } from "../../../../utils/datav-color";

  export default {
    name: "DvDecoration9",
    mixins: [autoResize],
    props: {
      color: {
        type: Array,
        default: () => ([])
      },
      dur: {
        type: Number,
        default: 3
      }
    },
    data() {
      const id = UUID2(32);
      return {
        ref: "decoration-9",
        polygonId: `decoration-9-polygon-${id}`,
        svgWH: [100, 100],
        svgScale: [1, 1],
        defaultColor: ["rgba(3, 166, 224, 0.8)", "rgba(3, 166, 224, 0.5)"],
        mergedColor: []
      };
    },
    watch: {
      color() {
        const { mergeColor } = this;
        mergeColor();
      }
    },
    methods: {
      afterAutoResizeMixinInit() {
        const { calcScale } = this;
        calcScale();
      },
      calcScale() {
        const { width, height, svgWH } = this;
        const [w, h] = svgWH;
        this.svgScale = [width / w, height / h];
      },
      onResize() {
        const { calcScale } = this;
        calcScale();
      },
      mergeColor() {
        const { color, defaultColor } = this;
        this.mergedColor = mergeDeep(cloneDeep(defaultColor, true), color || []);
      },
      fade
    },
    mounted() {
      const { mergeColor } = this;
      mergeColor();
    }
  };
</script>

<style lang="less" scoped>
  .dv-decoration-9 {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;

    svg {
      position: absolute;
      left: 0px;
      top: 0px;
      transform-origin: left top;
    }
  }
</style>
